Table 2.
Mean change scores, ROC curve statistics and MIC values for the Quick-DASH at 3 and 6 months*
| 3 months | 6 months | |
|---|---|---|
| Absolute mean changes | ||
| Improved | 21.4 (18.4;24.3) | 24.9 (21.8;28.0) |
| Unchanged | 1.8 (−1.27;4.91) | 4.9 (1.0;8.8) |
| Relative mean changes, % | ||
| Improved | 58.1 (52.3;63.8) | 68.7 (63.8;73.7) |
| Unchanged | −3.3 (−19.1;12.6) | 6.8 (− 8.8;22.3) |
| Absolute ROC AUC | 0.84 (0.79;0.90) | 0.83 (0.77;0.90) |
| Relative ROC AUC | 0.86 (0.81;0.92) | 0.90 (0.85;0.95) |
| MIC values | ||
| MIC ROC a | 9.1 | 13.6 |
| MIC 95% upper limit b | 21.3 | 27.8 |
| MIC percentages c | 33.3 | 41.7 |
Abbreviations: AUC Area Under the Curve, MIC Minimal important change, ROC Receiver operating characteristics, Quick-DASH, shortened version of the Disabilities of the Arm, Hand and Shoulder
*Values in parentheses are 95% confidence interval. 3 months: improved (n = 129); unchanged (n = 59), 6 months: improved (n = 125); unchanged (n = 51)
a Estimated as the optimal cutoff point of the ROC curve using absolute change scores
b Estimated as the 95% cutoff limit for the unchanged group
c Estimated as the optimal cutoff point of the ROC curve using relative change scores